The map stopped working when the site was upgraded from ver 5.5 php to 7.
This secured the site allowing https to be used.

As only 2 people noticed in over 4 months, it was clearly not used. The developer of the map has not got around to changing his script and may never do so.
If Jeff has found a new version that can bypass Google profit making system, I'm sure a new one will appear.

Jeff not sure your aware or not but support for PHP7 stops in 12/2018